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n/9+4=12
We move all terms to the left:
n/9+4-(12)=0
We add all the numbers together, and all the variables
n/9-8=0
We multiply all the terms by the denominator
n-8*9=0
We add all the numbers together, and all the variables
n-72=0
We move all terms containing n to the left, all other terms to the right
n=72
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